Mail not working on iPhone after iOS 18 Update

Hi guys,


After updating my iPhone from iOS 17.7 to 18, I encountered an error with my work email. It's showing "IMAP server is not responding."Our mail server uses TLS version 1.1. Does iOS 18 support this version? Can you confirm?




[Re-Titled by Moderator]

iPhone 12, iOS 18

Posted on Sep 16, 2024 10:04 PM

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Posted on Sep 17, 2024 8:49 PM

I’d get the server to TLSv1.2 and with forward security configured minimally, and test again.


IMAP (read, receive) and ESMTP (send) are separate network services, so check both.


There are various ways to check the TLS and cipher offers by a server, and curl and testssl among those,:


https://stackoverflow.com/questions/40557031/command-prompt-to-check-tls-version-required-by-a-host


Also check the IMAP and ESMTP server logs for any failure-relevant details that might be included there.

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Mail not working on iPhone after iOS 18 Update

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